log

package
v0.13.0 Latest Latest
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 Go to latest Published: Jan 25, 2024 License: MIT Imports: 19 Imported by: 0

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Constants

View Source 
const (
	LevelTrace = "trace"
	LevelDebug = "debug"
	LevelInfo  = "info"
	LevelWarn  = "warn"
	LevelError = "error"

	PriorityTrace = 0
	PriorityDebug = 1
	PriorityInfo  = 2
	PriorityWarn  = 3
	PriorityError = 4
)
View Source 
const MessageAttributeLoggerContext = "logger:context"

Variables

This section is empty.

Functions

func AddHandlerFactory 

func AddHandlerFactory(typ string, factory HandlerFactory)

func AddHandlerIoWriterFactory 

func AddHandlerIoWriterFactory(typ string, factory IoWriterWriterFactory)

func AppendContextFields added in v0.13.0 

func AppendContextFields(ctx context.Context, newFields map[string]any) context.Context

AppendContextFields appends the fields to the existing local context, creating a new context containing the merged fields.

Any existing fields with the same key as any new field provided will be overwritten.

This method breaks mutation links for the local context only. If you mutate global fields on the returned context and the original context was already mutable, it will see these changes as well. Example: 

func mutateFields() {
	ctx := log.InitContext(context.Background())
	localCtx := log.AppendContextFields(ctx, map[string]any{
		"field": "value",
	})

	// mutations of local fields are only propagated to the local context
	localCtx = log.MutateContextFields(localCtx, map[string]any{
		"field": "new_value",
	})
	localFields := log.LocalOnlyContextFieldsResolver(localCtx)
	print(localFields["field"]) // "new_value"
	// the parent context wasn't changed
	localFields = log.LocalOnlyContextFieldsResolver(ctx)
	print(len(localFields)) // 0

	// mutations of global fields are still propagated to the original context
	localCtx = log.MutateGlobalContextFields(localCtx, map[string]any{
		"other_field": "other_value",
	})
	globalFields := log.GlobalContextFieldsResolver(ctx)
	print(globalFields["other_field"]) // "other_value"
}

func AppendGlobalContextFields added in v0.13.0 

func AppendGlobalContextFields(ctx context.Context, newFields map[string]any) context.Context

AppendGlobalContextFields is similar to AppendContextFields, but appends to global fields instead.

func ContextFieldsResolver 

func ContextFieldsResolver(ctx context.Context) map[string]any

ContextFieldsResolver extracts the local and global fields from a context and, if not present, it returns an empty map.

Global fields overwrite local fields of the same name.

func FormatterConsole 

func FormatterConsole(timestamp string, level int, format string, args []interface{}, err error, data Data) ([]byte, error)

func FormatterJson 

func FormatterJson(timestamp string, level int, format string, args []interface{}, err error, data Data) ([]byte, error)

func GetMockedStackTrace 

func GetMockedStackTrace(depthSkip int) string

func GetStackTrace 

func GetStackTrace(depthSkip int) string

GetStackTrace constructs the current stacktrace. depthSkip defines how many steps of the stacktrace should be skipped. This is useful to not clutter the stacktrace with logging function calls.

func GlobalContextFieldsResolver added in v0.13.0 

func GlobalContextFieldsResolver(ctx context.Context) map[string]any

GlobalContextFieldsResolver extracts the global fields from a context and, if not present, it returns an empty map.

func InitContext added in v0.13.0 

func InitContext(ctx context.Context) context.Context

InitContext returns a new context capable of carrying (mutable) local and global logger fields.

---------------------------------------------------------------------------------------------------------------------

A note about local and global context fields:

  • A local field is private to the current application. It will NOT be attached to stream.Messages or transferred in some other way to another service. Thus, it is somewhat cheaper to add local fields to a context as they will only not affect any downstream applications or increase message size.
  • A global field is the inverse of a local field. It will be forwarded with a message and thus "infect" other services. For some fields this might be desirable, for example, to record the identity of the user of an event. You should however be careful when adding many global fields as they will increase the size of any encoded message.

When logging messages, global fields overwrite local fields if they share the same name.

---------------------------------------------------------------------------------------------------------------------

A note about mutability: After using any of the methods returning a new context from this file (InitContext, AppendContextFields, MutateContextFields, AppendGlobalContextFields, MutateGlobalContextFields), the returned context will be mutable. This means that you can add context fields using MutateContextFields or MutateGlobalContextFields to the existing context (even though a new context is returned, it will be the same context if the context was already mutable). This allows for the following pattern: 

func caller(ctx context.Context, logger log.Logger, input int) {
	ctx = log.InitContext(ctx)

	if result, err := callee(ctx, input); err == nil {
		logger.WithContext(ctx).Info("Computed result %d", result)
	} else {
		logger.WithContext(ctx).Error("Failed to compute result: %w", err)
	}
}

func callee(ctx context.Context, input int) (int, error) {
	_ = log.MutateContextFields(ctx, map[string]any{
		"input_value": input,
	})

	if input < 10 {
		return 0, fmt.Errorf("input must not be smaller than 10")
	}

	return input - 10, nil
}

After the callee returns, we add the (now mutated) context to the logger and will see the original input value in the logged fields even though it was for example not included in the error we got back.

func LevelName 

func LevelName(level int) string

func LevelPriority 

func LevelPriority(level string) int

func LocalOnlyContextFieldsResolver added in v0.13.0 

func LocalOnlyContextFieldsResolver(ctx context.Context) map[string]any

LocalOnlyContextFieldsResolver extracts the local fields from a context and, if not present, it returns an empty map.

Warning: Besides very specific circumstances this method is most likely not what you want. Consider using GlobalContextFieldsResolver or ContextFieldsResolver instead. Outside of tests there shouldn't normally be a need to ignore any configured global fields from a context.

func MainLoggerConfigPostProcessor 

func MainLoggerConfigPostProcessor(config cfg.GosoConf) (bool, error)

func MutateContextFields added in v0.13.0 

func MutateContextFields(ctx context.Context, newFields map[string]any) context.Context

MutateContextFields is similar to AppendContextFields, but it mutates the fields from the context if the context already contains fields which can be mutated. Otherwise, it initializes a new context able to carry fields in the future.

func MutateGlobalContextFields added in v0.13.0 

func MutateGlobalContextFields(ctx context.Context, newFields map[string]any) context.Context

MutateGlobalContextFields is similar to MutateContextFields, but mutates to global fields instead.

func NewHandlerIoWriter 

func NewHandlerIoWriter(level string, channels []string, formatter Formatter, timestampFormat string, writer io.Writer) *handlerIoWriter

func NewIoWriterFile 

func NewIoWriterFile(path string) (io.Writer, error)

func NewLogger 

func NewLogger() *gosoLogger

func NewLoggerWithInterfaces 

func NewLoggerWithInterfaces(clock clock.Clock, handlers []Handler) *gosoLogger

func SentryContextConfigProvider 

func SentryContextConfigProvider(config ConfigProvider, handler *HandlerSentry) error

func SentryContextEcsMetadataProvider 

func SentryContextEcsMetadataProvider(_ ConfigProvider, handler *HandlerSentry) error

func UnmarshalHandlerSettingsFromConfig 

func UnmarshalHandlerSettingsFromConfig(config cfg.Config, name string, settings interface{})

Types

type ConfigProvider 

type ConfigProvider interface {
	AllSettings() map[string]interface{}
}

type ContextEnforcingLogger 

type ContextEnforcingLogger struct {
	// contains filtered or unexported fields
}

func NewContextEnforcingLogger 

func NewContextEnforcingLogger(logger Logger) *ContextEnforcingLogger

func NewContextEnforcingLoggerWithInterfaces 

func NewContextEnforcingLoggerWithInterfaces(logger Logger, stacktraceProvider StackTraceProvider, notifier Logger) *ContextEnforcingLogger

func (*ContextEnforcingLogger) Debug 

func (l *ContextEnforcingLogger) Debug(msg string, args ...interface{})

func (*ContextEnforcingLogger) Enable 

func (l *ContextEnforcingLogger) Enable()

func (*ContextEnforcingLogger) Error 

func (l *ContextEnforcingLogger) Error(msg string, args ...interface{})

func (*ContextEnforcingLogger) Info 

func (l *ContextEnforcingLogger) Info(msg string, args ...interface{})

func (*ContextEnforcingLogger) Warn 

func (l *ContextEnforcingLogger) Warn(msg string, args ...interface{})

func (*ContextEnforcingLogger) WithChannel 

func (l *ContextEnforcingLogger) WithChannel(channel string) Logger

func (*ContextEnforcingLogger) WithContext 

func (l *ContextEnforcingLogger) WithContext(ctx context.Context) Logger

func (*ContextEnforcingLogger) WithFields 

func (l *ContextEnforcingLogger) WithFields(fields Fields) Logger

type ContextFieldsResolverFunction added in v0.13.0 

type ContextFieldsResolverFunction func(ctx context.Context) map[string]any

type Data 

type Data struct {
	Context       context.Context
	Channel       string
	ContextFields map[string]interface{}
	Fields        map[string]interface{}
}

type EcsMetadata 

type EcsMetadata map[string]interface{}

func ReadEcsMetadata 

func ReadEcsMetadata() (EcsMetadata, error)

type Fields 

type Fields map[string]interface{}

type Formatter 

type Formatter func(timestamp string, level int, format string, args []interface{}, err error, data Data) ([]byte, error)

type GosoLogger 

type GosoLogger interface {
	Logger
	Option(opt ...Option) error
}

type Handler 

type Handler interface {
	Channels() []string
	Level() int
	Log(timestamp time.Time, level int, msg string, args []interface{}, err error, data Data) error
}

func NewCliHandler 

func NewCliHandler() Handler

func NewHandlersFromConfig 

func NewHandlersFromConfig(config cfg.Config) ([]Handler, error)

type HandlerFactory 

type HandlerFactory func(config cfg.Config, name string) (Handler, error)

type HandlerIoWriterSettings 

type HandlerIoWriterSettings struct {
	Level           string   `cfg:"level" default:"info"`
	Channels        []string `cfg:"channels"`
	Formatter       string   `cfg:"formatter" default:"console"`
	TimestampFormat string   `cfg:"timestamp_format" default:"15:04:05.000"`
	Writer          string   `cfg:"writer" default:"stdout"`
}

type HandlerSentry 

type HandlerSentry struct {
	// contains filtered or unexported fields
}

func NewHandlerSentry 

func NewHandlerSentry(config cfg.Config) (*HandlerSentry, error)

func (*HandlerSentry) Channels 

func (h *HandlerSentry) Channels() []string

func (*HandlerSentry) Level 

func (h *HandlerSentry) Level() int

func (*HandlerSentry) Log 

func (h *HandlerSentry) Log(_ time.Time, _ int, _ string, _ []interface{}, err error, data Data) error

func (*HandlerSentry) WithContext 

func (h *HandlerSentry) WithContext(name string, context map[string]interface{})

type HandlerSettings 

type HandlerSettings struct {
	Type string `cfg:"type"`
}

type IoWriterWriterFactory 

type IoWriterWriterFactory func(config cfg.Config, configKey string) (io.Writer, error)

type Logger 

type Logger interface {
	Debug(format string, args ...interface{})
	Info(format string, args ...interface{})
	Warn(format string, args ...interface{})
	Error(format string, args ...interface{})

	WithChannel(channel string) Logger
	WithContext(ctx context.Context) Logger
	WithFields(Fields) Logger
}

func NewCliLogger 

func NewCliLogger() Logger

func NewSamplingLogger 

func NewSamplingLogger(logger Logger, interval time.Duration) Logger

type LoggerSettings 

type LoggerSettings struct {
	Handlers map[string]HandlerSettings `cfg:"handlers"`
}

type MessageWithLoggingFieldsEncoder 

type MessageWithLoggingFieldsEncoder struct {
	// contains filtered or unexported fields
}

func NewMessageWithLoggingFieldsEncoder 

func NewMessageWithLoggingFieldsEncoder(_ cfg.Config, logger Logger) *MessageWithLoggingFieldsEncoder

func NewMessageWithLoggingFieldsEncoderWithInterfaces 

func NewMessageWithLoggingFieldsEncoderWithInterfaces(logger Logger) *MessageWithLoggingFieldsEncoder

func (MessageWithLoggingFieldsEncoder) Decode 

func (m MessageWithLoggingFieldsEncoder) Decode(ctx context.Context, _ interface{}, attributes map[string]string) (context.Context, map[string]string, error)

func (MessageWithLoggingFieldsEncoder) Encode 

func (m MessageWithLoggingFieldsEncoder) Encode(ctx context.Context, _ interface{}, attributes map[string]string) (context.Context, map[string]string, error)

type Option 

type Option func(logger *gosoLogger) error

func WithContextFieldsResolver 

func WithContextFieldsResolver(resolvers ...ContextFieldsResolverFunction) Option

func WithFields 

func WithFields(tags map[string]interface{}) Option

func WithHandlers 

func WithHandlers(handler ...Handler) Option

type SamplingLogger 

type SamplingLogger struct {
	Logger
	// contains filtered or unexported fields
}

func NewSamplingLoggerWithInterfaces 

func NewSamplingLoggerWithInterfaces(logger Logger, clock clock.Clock, interval time.Duration) *SamplingLogger

func (*SamplingLogger) Debug 

func (l *SamplingLogger) Debug(msg string, args ...interface{})

func (*SamplingLogger) Error 

func (l *SamplingLogger) Error(msg string, args ...interface{})

func (*SamplingLogger) Info 

func (l *SamplingLogger) Info(msg string, args ...interface{})

func (*SamplingLogger) Warn 

func (l *SamplingLogger) Warn(msg string, args ...interface{})

func (*SamplingLogger) WithChannel 

func (l *SamplingLogger) WithChannel(channel string) Logger

func (*SamplingLogger) WithContext 

func (l *SamplingLogger) WithContext(ctx context.Context) Logger

func (*SamplingLogger) WithFields 

func (l *SamplingLogger) WithFields(fields Fields) Logger

type SentryContextProvider 

type SentryContextProvider func(config ConfigProvider, sentryHook *HandlerSentry) error

type SentryHub 

type SentryHub interface {
	ConfigureScope(f func(scope *sentry.Scope))
	WithScope(f func(scope *sentry.Scope))
	CaptureException(exception error) *sentry.EventID
	Flush(timeout time.Duration) bool
}

func NewSentryHub 

func NewSentryHub(config cfg.Config) (SentryHub, error)

func NewSentryHubWithSettings 

func NewSentryHubWithSettings(settings *SentryHubSettings) (SentryHub, error)

type SentryHubSettings 

type SentryHubSettings struct {
	Dsn         string
	Environment string
	AppName     string
}

type StackTraceProvider 

type StackTraceProvider func(depthSkip int) string

Source Files

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Directories

Path Synopsis
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